With Wall Street displaying a voracious appetite for enterprise software stocks, companies are lining up for IPOs.

Redwood City's Silver Spring Networks -- whose plans for an initial public offering have languished for more than a year -- and Ruckus Wireless of Sunnyvale are among those expected to go public within days or weeks. They hope to ride on the coattails of Silicon Valley companies like Palo Alto Networks, Qualys and Workday, which recently have seen their stock offerings soar.

Yet some observers fear that, in the frenzy of opportunity, unqualified candidates might squeak through the IPO window -- and, if they perform poorly, spoil the party for other companies.

"Silicon Valley in part is like Hollywood: When there's a successful space alien movie, then you have six space alien movies," said Lise Buyer, the investment banking veteran who took Google (GOOG) public eight years ago and now counsels startups on the IPO process.

"When everybody was hot to trot about social media, nobody cared about enterprise software," Buyer continued. But by helping companies manage their fast-growing digital data, or delivering software remotely via the cloud to save clients money, the current troupe of enterprise startups is wowing investors with rapid growth and a ready audience of paying customers.

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Also driving more companies toward the IPO threshold is the JOBS Act, new federal legislation that lets companies file plans to go public with the Securities and Exchange Commission in private. If initial signs suggest a lack of investor interest, companies can pull out of the IPO queue without having shared proprietary financial data with the world.

Workday, Ruckus and SolarCity are among local companies that have taken advantage of the new rules, which only require a filing to be published within a few weeks of the pre-IPO "roadshow" for prospective investors.

"It keeps your competitors guessing, and you don't go through a Groupon-like, public SEC review that can taint your stock," said Dave Flynn, CEO of Aerohive Networks. The Sunnyvale company, like Ruckus, makes next-generation wireless networking technology for corporate clients and is widely expected to begin the IPO process in coming months.

Flynn said "a lot of real good companies got built quietly between 2008 and 2010," when the media and venture capitalists were focused first on the global credit crunch, then on the rise of social media.

With many of those business-to-business companies now primed to go public, "some of these VCs are going to make a lot of money," said Flynn, who was himself an early adviser to Palo Alto Networks (and likely made a small fortune in its July IPO).

Sam Hamadeh, head of New York financial analysis firm PrivCo, said an already warm IPO market grew superheated during a one-week stretch last month in which five companies -- including Pleasanton's Workday -- saw their share prices rise 20 percent or more on their first day of trading.

Hamadeh said it was the first time in a decade that so many IPOs have soared in the same week.

"These run-ups in pricing are a strong indicator that IPO investor sentiment is high -- at least for 'favored' sectors" such as enterprise software, Hamadeh wrote in a note to his firm's clients.

In fact, he said half of the year's initial public offerings have been by companies focused on those emerging technologies. And the pace began picking up in mid-September, with 20 IPO primings in a 30-day period.

Hamadeh said he expects Silver Spring Networks -- which sells cloud-based networking software to utility companies, including PG&E and Commonwealth Edison -- to begin its investor roadshow this month.

Company officials, citing SEC "quiet period" rules that precede an IPO, declined to comment for this story. But Hamadeh told this newspaper, "My sources say they want to get out ASAP, while the IPO window's open."

Silver Spring filed to go public in mid-2011, then was forced into a holding pattern as global stock markets went limp and investors soured on cleantech in the wake of the Solyndra scandal.

While Silver Spring can justly reposition itself to investors as a cloud-computing company serving deep-pocketed corporate clients, SolarCity -- a solar-panel installer that unveiled its SEC filings last month -- is coming out at a time many solar manufacturers have gone bankrupt or yanked IPO plans.

And the company, according to its IPO filing, is being investigated by the U.S. Treasury Department and the IRS for allegedly overstating the value of its solar panels when claiming federal cash grants. A SolarCity representative did not immediately return a call for comment, though the company faces the same quiet period restrictions as Silver Spring and Ruckus.

Despite such potentially worrisome flags, Hamadeh said SolarCity -- whose biggest shareholder is Tesla Motors (TSLA) and SpaceX CEO Elon Musk -- wants to go public before year's end "for a couple of reasons." "It's showing strong top-line growth. And despite the gloom over the solar market, their growth story is one of the few bright spots in the industry."

"With any window, you have a higher percentage of very strong companies at the beginning," she said, "because the guys who broke the logjam had to be really good for investors to pay attention. Then, the success of the trailblazers inspires also-rans as well."

Yet she contrasted the current landscape to the frothier dot-com era.

"One of the good things we've seen about all IPOs in the last 12 months is that the market has been very selective," she said. "We've seen companies pull their deals, and that's encouraging. It shows that those companies that get to the roadshow finish line have been vetted and therefore should perform better as public companies -- keeping the window open longer."

Contact Peter Delevett at 408-271-3638. Follow him at Twitter.com/mercwiretap.

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